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Fast, secure image processing server and Go library, using libvips

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imagor is a fast, secure image processing server and Go library.

imagor uses one of the most efficient image processing librarylibvips. It is typically 4-8xfaster than using the quickest ImageMagick and GraphicsMagick settings.imagor implements libvipsstreaming that facilitates parallel processing pipelines, achieving high network throughput.

imagor features a ton of image processing use cases, available as a HTTP server with first-class Docker support. It adopts thethumbor URL syntax representing a high-performance drop-in replacement.

imagor is a Go library built with speed, security and extensibility in mind. Alongside there isimagorvideo bringing video thumbnail capability through ffmpeg C bindings.

Quick Start

docker run -p 8000:8000 shumc/imagor -imagor-unsafe -imagor-auto-webp

Original images:

https://raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.pnghttps://raw.githubusercontent.com/cshum/imagor/master/testdata/dancing-banana.gifhttps://raw.githubusercontent.com/cshum/imagor/master/testdata/gopher-front.png

Try out the following image URLs:

http://localhost:8000/unsafe/fit-in/200x200/filters:fill(white)/https://raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.pnghttp://localhost:8000/unsafe/200x200/smart/filters:fill(white):format(jpeg):quality(80)/https://raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.pnghttp://localhost:8000/unsafe/fit-in/-180x180/10x10/filters:hue(290):saturation(100):fill(yellow)/raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.pnghttp://localhost:8000/unsafe/30x40:100x150/filters:fill(cyan)/raw.githubusercontent.com/cshum/imagor/master/testdata/dancing-banana.gifhttp://localhost:8000/unsafe/fit-in/200x150/filters:fill(yellow):watermark(raw.githubusercontent.com/cshum/imagor/master/testdata/gopher-front.png,repeat,bottom,0,40,40)/raw.githubusercontent.com/cshum/imagor/master/testdata/dancing-banana.gif

Image Endpoint

imagor endpoint is a series of URL parts which defines the image operations, followed by the image URI:

/HASH|unsafe/trim/AxB:CxD/fit-in/stretch/-Ex-F/GxH:IxJ/HALIGN/VALIGN/smart/filters:NAME(ARGS):NAME(ARGS):.../IMAGE
  • HASH is the URL signature hash, orunsafe if unsafe mode is used
  • trim removes surrounding space in images using top-left pixel color
  • AxB:CxD means manually crop the image at left-top pointAxB and right-bottom pointCxD. Coordinates can also be provided as float values between 0 and 1 (percentage of image dimensions)
  • fit-in means that the generated image should not be auto-cropped and otherwise just fit in an imaginary box specified byExF
  • stretch means resize the image toExF without keeping its aspect ratios
  • -Ex-F means resize the image to beExF of width per height size. The minus signs mean flip horizontally and vertically
  • GxH:IxJ add left-top paddingGxH and right-bottom paddingIxJ
  • HALIGN is horizontal alignment of crop. Acceptsleft,right orcenter, defaults tocenter
  • VALIGN is vertical alignment of crop. Acceptstop,bottom ormiddle, defaults tomiddle
  • smart means using smart detection of focal points
  • filters a pipeline of image filter operations to be applied, see filters section
  • IMAGE is the image path or URI
    • For image URI that contains? character, this will interfere the URL query and should be encoded withencodeURIComponent or equivalent

Filters

Filters/filters:NAME(ARGS):NAME(ARGS):.../ is a pipeline of image operations that will be sequentially applied to the image. Examples:

/filters:fill(white):format(jpeg)//filters:hue(290):saturation(100):fill(yellow):format(jpeg):quality(80)//filters:fill(white):watermark(raw.githubusercontent.com/cshum/imagor/master/testdata/gopher-front.png,repeat,bottom,10):format(jpeg)/

imagor supports the following filters:

  • background_color(color) sets the background color of a transparent image
    • color the color name or hexadecimal rgb expression without the “#” character
  • blur(sigma) applies gaussian blur to the image
  • brightness(amount) increases or decreases the image brightness
    • amount -100 to 100, the amount in % to increase or decrease the image brightness
  • contrast(amount) increases or decreases the image contrast
    • amount -100 to 100, the amount in % to increase or decrease the image contrast
  • fill(color) fill the missing area or transparent image with the specified color:
    • color - color name or hexadecimal rgb expression without the “#” character
      • If color is "blur" - missing parts are filled with blurred original image
      • If color is "auto" - the top left image pixel will be chosen as the filling color
      • If color is "none" - the filling would become fully transparent
  • focal(AxB:CxD) orfocal(X,Y) adds a focal region or focal point for custom transformations:
    • Coordinated by a region of left-top pointAxB and right-bottom pointCxD, or a pointX,Y.
    • Also accepts float values between 0 and 1 that represents percentage of image dimensions.
  • format(format) specifies the output format of the image
    • format accepts jpeg, png, gif, webp, tiff, avif, jp2
  • grayscale() changes the image to grayscale
  • hue(angle) increases or decreases the image hue
    • angle the angle in degree to increase or decrease the hue rotation
  • label(text, x, y, size, color[, alpha[, font]]) adds a text label to the image. It can be positioned inside the image with the alignment specified, color and transparency support:
    • text text label, also support url encoded text.
    • x horizontal position that the text label will be in:
      • Positive number indicate position from the left, negative number from the right.
      • Number followed by ap e.g. 20p means calculating the value from the image width as percentage
      • left,right,center align left, right or centered respectively
    • y vertical position that the text label will be in:
      • Positive number indicate position from the top, negative number from the bottom.
      • Number followed by ap e.g. 20p means calculating the value from the image height as percentage
      • top,bottom,center vertical align top, bottom or centered respectively
    • size - text label font size
    • color - color name or hexadecimal rgb expression without the “#” character
    • alpha - text label transparency, a number between 0 (fully opaque) and 100 (fully transparent).
    • font - text label font type
  • max_bytes(amount) automatically degrades the quality of the image until the image is under the specifiedamount of bytes
  • max_frames(n) limit maximum number of animation framesn to be loaded
  • orient(angle) rotates the image before resizing and cropping, according to the angle value
    • angle accepts 0, 90, 180, 270
  • page(num) specify page number for PDF, or frame number for animated image, starts from 1
  • dpi(num) specify the dpi to render at for PDF and SVG
  • proportion(percentage) scales image to the proportion percentage of the image dimension
  • quality(amount) changes the overall quality of the image, does nothing for png
    • amount 0 to 100, the quality level in %
  • rgb(r,g,b) amount of color in each of the rgb channels in %. Can range from -100 to 100
  • rotate(angle) rotates the given image according to the angle value
    • angle accepts 0, 90, 180, 270
  • round_corner(rx [, ry [, color]]) adds rounded corners to the image with the specified color as background
    • rx,ry amount of pixel to use as radius. ry = rx if ry is not provided
    • color the color name or hexadecimal rgb expression without the “#” character
  • saturation(amount) increases or decreases the image saturation
    • amount -100 to 100, the amount in % to increase or decrease the image saturation
  • sharpen(sigma) sharpens the image
  • strip_exif() removes Exif metadata from the resulting image
  • strip_icc() removes ICC profile information from the resulting image
  • strip_metadata() removes all metadata from the resulting image
  • upscale() upscale the image iffit-in is used
  • watermark(image, x, y, alpha [, w_ratio [, h_ratio]]) adds a watermark to the image. It can be positioned inside the image with the alpha channel specified and optionally resized based on the image size by specifying the ratio
    • image watermark image URI, using the same image loader configured for imagor
    • x horizontal position that the watermark will be in:
      • Positive number indicate position from the left, negative number from the right.
      • Number followed by ap e.g. 20p means calculating the value from the image width as percentage
      • left,right,center positioned left, right or centered respectively
      • repeat the watermark will be repeated horizontally
    • y vertical position that the watermark will be in:
      • Positive number indicate position from the top, negative number from the bottom.
      • Number followed by ap e.g. 20p means calculating the value from the image height as percentage
      • top,bottom,center positioned top, bottom or centered respectively
      • repeat the watermark will be repeated vertically
    • alpha watermark image transparency, a number between 0 (fully opaque) and 100 (fully transparent).
    • w_ratio percentage of the width of the image the watermark should fit-in
    • h_ratio percentage of the height of the image the watermark should fit-in

Utility Filters

These filters do not manipulate images but provide useful utilities to the imagor pipeline:

  • attachment(filename) returns attachment in theContent-Disposition header, and the browser will open a "Save as" dialog withfilename. Whenfilename not specified, imagor will get the filename from the image source
  • expire(timestamp) adds expiration time to the content.timestamp is the unix milliseconds timestamp, e.g. if content is valid for 30s then timestamp would beDate.now() + 30*1000 in JavaScript.
  • preview() skips the result storage even if result storage is enabled. Useful for conditional caching
  • raw() response with a raw unprocessed and unchecked source image. Image still loads from loader and storage but skips the result storage

Loader, Storage and Result Storage

imagorLoader,Storage andResult Storage are the building blocks for loading and saving images from various sources:

  • Loader loads image. EnableLoader where you wish to load images from, but without modifying it e.g. static directory.
  • Storage loads and saves image. This allows subsequent requests for the same image loads directly from the storage, instead of HTTP source.
  • Result Storage loads and saves the processed image. This allows subsequent request of the same parameters loads from the result storage, saving processing resources.

imagor provides built-in adaptors that support HTTP(s), Proxy, File System, AWS S3 and Google Cloud Storage. By default,HTTP Loader is used as fallback. You can choose to enable additional adaptors that fit your use cases.

File System

Docker Compose example with file system, using mounted volume:

version:"3"services:imagor:image:shumc/imagor:latestvolumes:      -./:/mnt/dataenvironment:PORT:8000IMAGOR_UNSAFE:1# unsafe URL for testingFILE_LOADER_BASE_DIR:/mnt/data# enable file loader by specifying base dirFILE_STORAGE_BASE_DIR:/mnt/data# enable file storage by specifying base dirFILE_STORAGE_MKDIR_PERMISSION:0755# optionalFILE_STORAGE_WRITE_PERMISSION:0666# optionalFILE_RESULT_STORAGE_BASE_DIR:/mnt/data/result# enable file result storage by specifying base dirFILE_RESULT_STORAGE_MKDIR_PERMISSION:0755# optionalFILE_RESULT_STORAGE_WRITE_PERMISSION:0666# optionalports:      -"8000:8000"

AWS S3

Docker Compose example with AWS S3. Also works with S3 compatible such as MinIO, DigitalOcean Space.

version:"3"services:imagor:image:shumc/imagor:latestenvironment:PORT:8000IMAGOR_SECRET:mysecret# secret key for URL signatureAWS_ACCESS_KEY_ID:...AWS_SECRET_ACCESS_KEY:...AWS_REGION:...S3_LOADER_BUCKET:mybucket# enable S3 loader by specifying bucketS3_LOADER_BASE_DIR:images# optionalS3_STORAGE_BUCKET:mybucket# enable S3 storage by specifying bucketS3_STORAGE_BASE_DIR:images# optionalS3_STORAGE_ACL:public-read# optional - see https://docs.aws.amazon.com/AmazonS3/latest/userguide/acl-overview.html#canned-aclS3_RESULT_STORAGE_BUCKET:mybucket# enable S3 result storage by specifying bucketS3_RESULT_STORAGE_BASE_DIR:images/result# optionalS3_RESULT_STORAGE_ACL:public-read# optionalports:      -"8000:8000"
Custom S3 Endpoint

Configure custom S3 endpoint for S3 compatible such as MinIO, DigitalOcean Space:

S3_ENDPOINT:http://minio:9000S3_FORCE_PATH_STYLE:1

By default, S3 prepends bucket name as subdomain to the request URL:

http://mybucket.minio:9000/image.jpg

this may not be desirable for a self-hosted endpoint. You can also switch topath-style requests usingS3_FORCE_PATH_STYLE=1 such that the host remains unchanged:

http://minio:9000/mybucket/image.jpg
Different AWS Credentials for S3 Loader, Storage and Result Storage

Set the following environment variables to override the global AWS Credentials for S3 Loader, Storage and Result Storage:

AWS_LOADER_REGIONAWS_LOADER_ACCESS_KEY_IDAWS_LOADER_SECRET_ACCESS_KEYS3_LOADER_ENDPOINTAWS_STORAGE_REGIONAWS_STORAGE_ACCESS_KEY_IDAWS_STORAGE_SECRET_ACCESS_KEYS3_STORAGE_ENDPOINTAWS_RESULT_STORAGE_REGIONAWS_RESULT_STORAGE_ACCESS_KEY_IDAWS_RESULT_STORAGE_SECRET_ACCESS_KEYS3_RESULT_STORAGE_ENDPOINT

Google Cloud Storage

Docker Compose example with Google Cloud Storage:

version:"3"services:imagor:image:shumc/imagor:latestvolumes:      -./googlesecret:/etc/secrets/googleenvironment:PORT:8000IMAGOR_SECRET:mysecret# secret key for URL signatureGOOGLE_APPLICATION_CREDENTIALS:/etc/secrets/google/appcredentials.json# google cloud secrets fileGCLOUD_LOADER_BUCKET:mybucket# enable loader by specifying bucketGCLOUD_LOADER_BASE_DIR:images# optionalGCLOUD_STORAGE_BUCKET:mybucket# enable storage by specifying bucketGCLOUD_STORAGE_BASE_DIR:images# optionalGCLOUD_STORAGE_ACL:publicRead# optional - see https://cloud.google.com/storage/docs/json_api/v1/objects/insertGCLOUD_RESULT_STORAGE_BUCKET:mybucket# enable result storage by specifying bucketGCLOUD_RESULT_STORAGE_BASE_DIR:images/result# optionalGCLOUD_RESULT_STORAGE_ACL:publicRead# optionalports:      -"8000:8000"

Storage and Result Storage Path Style

Storage andResult Storage path style enables additional hashing rules to the storage path when loading and saving images:

IMAGOR_STORAGE_PATH_STYLE=digest

  • foobar.jpg becomese6/86/1a810ff186b4f747ef85f7c53946f0e6d8cb

IMAGOR_RESULT_STORAGE_PATH_STYLE=digest

  • fit-in/16x17/foobar.jpg becomes61/4c/9ba1725e8cdd8263a4ad437c56b35f33deba

IMAGOR_RESULT_STORAGE_PATH_STYLE=suffix

  • 166x169/top/foobar.jpg becomesfoobar.45d8ebb31bd4ed80c26e.jpg
  • 17x19/smart/example.com/foobar becomesexample.com/foobar.ddd349e092cda6d9c729

IMAGOR_RESULT_STORAGE_PATH_STYLE=size

  • 166x169/top/foobar.jpg becomesfoobar.45d8ebb31bd4ed80c26e_166x169.jpg
  • 17x19/smart/example.com/foobar becomesexample.com/foobar.ddd349e092cda6d9c729_17x19

Security

URL Signature

In production environment, it is highly recommended turning offIMAGOR_UNSAFE and setting up URL signature usingIMAGOR_SECRET, to prevent DDoS attacks that abuse multiple image operations.

The URL signature hash is based on SHA digest, created by taking the URL path (excluding/unsafe/) with secret. The hash is then Base64 URL encoded.An example in Node.js:

constcrypto=require('crypto');functionsign(path,secret){consthash=crypto.createHmac('sha1',secret).update(path).digest('base64').replace(/\+/g,'-').replace(/\//g,'_')returnhash+'/'+path}console.log(sign('500x500/top/raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.png','mysecret'))// cST4Ko5_FqwT3BDn-Wf4gO3RFSk=/500x500/top/raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.png

Custom HMAC Signer

imagor uses SHA1 HMAC signer by default, the same one used bythumbor. However, SHA1 is not considered cryptographically secure. If that is a concern it is possible to configure different signing method and truncate length. imagor supportssha1,sha256,sha512 signer type:

IMAGOR_SIGNER_TYPE=sha256IMAGOR_SIGNER_TRUNCATE=40

The Node.js example then becomes:

constcrypto=require('crypto');functionsign(path,secret){consthash=crypto.createHmac('sha256',secret).update(path).digest('base64').slice(0,40).replace(/\+/g,'-').replace(/\//g,'_')returnhash+'/'+path}console.log(sign('500x500/top/raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.png','mysecret'))// IGEn3TxngivD0jy4uuiZim2bdUCvhcnVi1Nm0xGy/500x500/top/raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.png

Image Bombs Prevention

imagor checks the image type and its resolution before the actual processing happens. The processing will be rejected if the image dimensions are too big, which protects from so-called "image bombs". You can set the max allowed image resolution and dimensions usingVIPS_MAX_RESOLUTION,VIPS_MAX_WIDTH,VIPS_MAX_HEIGHT:

VIPS_MAX_RESOLUTION=16800000VIPS_MAX_WIDTH=5000VIPS_MAX_HEIGHT=5000

Allowed Sources and Base URL

Whitelist specific hosts to restrict loading images only from the allowed sources usingHTTP_LOADER_ALLOWED_SOURCES orHTTP_LOADER_ALLOWED_SOURCE_REGEXP.

  • HTTP_LOADER_ALLOWED_SOURCES accepts csv wth glob pattern e.g.:

    HTTP_LOADER_ALLOWED_SOURCES=*.foobar.com,my.foobar.com,mybucket.s3.amazonaws.com

  • HTTP_LOADER_ALLOWED_SOURCE_REGEXP accepts a regular expression matching on the full URL e.g.:

    HTTP_LOADER_ALLOWED_SOURCE_REGEXP='^https://raw\.githubusercontent\.com/cshum/imagor/.*'

Alternatively, it is possible to set a base URL for loading images strictly from one HTTP source. This also trims down the base URL from image endpoint:

Example URL:

http://localhost:8000/unsafe/fit-in/200x150/filters:fill(yellow):watermark(raw.githubusercontent.com/cshum/imagor/master/testdata/gopher-front.png,repeat,bottom,0,40,40)/raw.githubusercontent.com/cshum/imagor/master/testdata/dancing-banana.gif

With HTTP Loader Base URL config:

HTTP_LOADER_BASE_URL=https://raw.githubusercontent.com/cshum/imagor/master

The example URL then becomes:

http://localhost:8000/unsafe/fit-in/200x150/filters:fill(yellow):watermark(testdata/gopher-front.png,repeat,bottom,0,40,40)/testdata/dancing-banana.gif

Metadata and Exif

imagor provides metadata endpoint that extracts information such as image format, resolution and Exif metadata.Under the hood, it tries to retrieve data just enough to extract the header, without reading and processing the whole image in memory.

To use the metadata endpoint, add/meta right after the URL signature hash before the image operations. Example:

http://localhost:8000/unsafe/meta/fit-in/50x50/raw.githubusercontent.com/cshum/imagor/master/testdata/Canon_40D.jpg
{"format":"jpeg","content_type":"image/jpeg","width":50,"height":34,"orientation":1,"pages":1,"bands":3,"exif":{"ApertureValue":"368640/65536","ColorSpace":1,"ComponentsConfiguration":"Y Cb Cr -","Compression":6,"DateTime":"2008:07:31 10:38:11","ISOSpeedRatings":100,"Make":"Canon","MeteringMode":5,"Model":"Canon EOS 40D",//...}}

Prepending/params to the existing endpoint returns the endpoint attributes in JSON form, useful for previewing the endpoint parameters. Example:

curl'http://localhost:8000/params/g5bMqZvxaQK65qFPaP1qlJOTuLM=/fit-in/500x400/0x20/filters:fill(white)/raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.png'

Go Library

imagor is a Go library built with speed, security and extensibility in mind.It facilitates high-level image processing in a modular architecture made up of a series of Go packages:

  • imagor - the imagor core library
  • imagorpath - parse and generate imagor endpoint
  • vips - libvips C bindings withimagor.Processor implementation
  • httploader - HTTP Loader, animagor.Loader implementation
  • filestorage - File Storage, animagor.Storage implementation
  • s3storage - AWS S3 Storage, animagor.Storage implementation
  • gcloudstorage - Google Cloud Storage, animagor.Storage implementation

Installlibvips and enable CGO:

  • brew install vips for Mac
  • CGO_CFLAGS_ALLOW=-Xpreprocessor being set to compile Go

See example below and alsoexamples folder for various ways you can use imagor:

package mainimport ("context""github.com/cshum/imagor""github.com/cshum/imagor/imagorpath""github.com/cshum/imagor/loader/httploader""github.com/cshum/imagor/vips""io""os")funcmain() {app:=imagor.New(imagor.WithLoaders(httploader.New()),imagor.WithProcessors(vips.NewProcessor()),)ctx:=context.Background()iferr:=app.Startup(ctx);err!=nil {panic(err)}deferapp.Shutdown(ctx)blob,err:=app.Serve(ctx, imagorpath.Params{Image:"https://raw.githubusercontent.com/cshum/imagor/master/testdata/gopher.png",Width:500,Height:500,Smart:true,Filters: []imagorpath.Filter{{"fill","white"},{"format","jpg"},},})iferr!=nil {panic(err)}reader,_,err:=blob.NewReader()iferr!=nil {panic(err)}deferreader.Close()file,err:=os.Create("gopher.jpg")iferr!=nil {panic(err)}deferfile.Close()if_,err:=io.Copy(file,reader);err!=nil {panic(err)}}

Configuration

imagor supports command-line arguments and environment variables for the arguments equivalent in capitalized snake case, see available optionsimagor -h.For instances-imagor-secret would becomeIMAGOR_SECRET:

# both are equivalentimagor -debug -imagor-secret 1234DEBUG=1 IMAGOR_SECRET=1234 imagor

Configuration can also be specified in a.env environment variable file and referenced with the-config flag:

imagor -config path/to/config.env

config.env:

PORT=8000IMAGOR_SECRET=mysecretDEBUG=1

Available options

imagor -hUsage of imagor:  -debug        Debug mode  -port int        Server port (default 8000)  -version        imagor version  -config string        Retrieve configuration from the given file (default ".env")  -imagor-secret string        Secret key for signing imagor URL  -imagor-unsafe        Unsafe imagor that does not require URL signature. Prone to URL tampering  -imagor-auto-webp        Output WebP format automatically if browser supports  -imagor-auto-avif        Output AVIF format automatically if browser supports (experimental)  -imagor-base-params string        imagor endpoint base params that applies to all resulting images e.g. filters:watermark(example.jpg)  -imagor-signer-type string        imagor URL signature hasher type: sha1, sha256, sha512 (default "sha1")  -imagor-signer-truncate int        imagor URL signature truncate at length  -imagor-result-storage-path-style string        imagor result storage path style: original, digest, suffix (default "original")  -imagor-storage-path-style string        imagor storage path style: original, digest (default "original")  -imagor-cache-header-ttl duration        imagor HTTP cache header ttl for successful image response (default 168h0m0s)  -imagor-cache-header-swr duration        imagor HTTP Cache-Control header stale-while-revalidate for successful image response (default 24h0m0s)  -imagor-cache-header-no-cache        imagor HTTP Cache-Control header no-cache for successful image response  -imagor-request-timeout duration        Timeout for performing imagor request (default 30s)  -imagor-load-timeout duration        Timeout for imagor Loader request, should be smaller than imagor-request-timeout  -imagor-save-timeout duration        Timeout for saving image to imagor Storage  -imagor-process-timeout duration        Timeout for image processing  -imagor-process-concurrency int        Maximum number of image process to be executed simultaneously. Requests that exceed this limit are put in the queue. Set -1 for no limit (default -1)  -imagor-process-queue-size int        Maximum number of image process that can be put in the queue. Requests that exceed this limit are rejected with HTTP status 429  -imagor-base-path-redirect string        URL to redirect for imagor / base path e.g. https://www.google.com  -imagor-modified-time-check        Check modified time of result image against the source image. This eliminates stale result but require more lookups  -imagor-disable-params-endpoint        imagor disable /params endpoint  -imagor-disable-error-body        imagor disable response body on error  -server-address string        Server address  -server-cors        Enable CORS  -server-strip-query-string        Enable strip query string redirection  -server-path-prefix string        Server path prefix  -server-access-log        Enable server access log  -prometheus-bind string        Specify address and port to enable Prometheus metrics, e.g. :5000, prom:7000  -prometheus-path string        Prometheus metrics path (default "/")          -http-loader-allowed-sources string        HTTP Loader allowed hosts whitelist to load images from if set. Accept csv wth glob pattern e.g. *.google.com,*.github.com.  -http-loader-base-url string        HTTP Loader base URL that prepends onto existing image path. This overrides the default scheme option.  -http-loader-forward-headers string        Forward request header to HTTP Loader request by csv e.g. User-Agent,Accept  -http-loader-override-response-headers string        Override HTTP Loader response header to image response by csv e.g. Cache-Control,Expires  -http-loader-forward-client-headers        Forward browser client request headers to HTTP Loader request  -http-loader-insecure-skip-verify-transport        HTTP Loader to use HTTP transport with InsecureSkipVerify true  -http-loader-max-allowed-size int        HTTP Loader maximum allowed size in bytes for loading images if set  -http-loader-proxy-urls string        HTTP Loader Proxy URLs. Enable HTTP Loader proxy only if this value present. Accept csv of proxy urls e.g. http://user:pass@host:port,http://user:pass@host:port  -http-loader-allowed-source-regexp string        HTTP Loader allowed hosts regexp to load images from if set. Combines as OR with allowed host glob pattern sources.  -http-loader-proxy-allowed-sources string        HTTP Loader Proxy allowed hosts that enable proxy transport, if proxy URLs are set. Accept csv wth glob pattern e.g. *.google.com,*.github.com.  -http-loader-default-scheme string        HTTP Loader default scheme if not specified by image path. Set "nil" to disable default scheme. (default "https")  -http-loader-accept string        HTTP Loader set request Accept header and validate response Content-Type header (default "*/*")   -http-loader-block-link-local-networks        HTTP Loader rejects connections to link local network IP addresses.  -http-loader-block-loopback-networks        HTTP Loader rejects connections to loopback network IP addresses.  -http-loader-block-private-networks        HTTP Loader rejects connections to private network IP addresses.  -http-loader-block-networks string        HTTP Loader rejects connections to link local network IP addresses. This options takes a comma separated list of networks in CIDR notation e.g ::1/128,127.0.0.0/8.  -http-loader-disable        Disable HTTP Loader  -file-safe-chars string        File safe characters to be excluded from image key escape. Set -- for no-op  -file-loader-base-dir string        Base directory for File Loader. Enable File Loader only if this value present  -file-loader-path-prefix string        Base path prefix for File Loader  -file-result-storage-base-dir string        Base directory for File Result Storage. Enable File Result Storage only if this value present  -file-result-storage-mkdir-permission string        File Result Storage mkdir permission (default "0755")  -file-result-storage-path-prefix string        Base path prefix for File Result Storage  -file-result-storage-write-permission string        File Storage write permission (default "0666")  -file-result-storage-expiration duration        File Result Storage expiration duration e.g. 24h. Default no expiration  -file-storage-base-dir string        Base directory for File Storage. Enable File Storage only if this value present  -file-storage-path-prefix string        Base path prefix for File Storage  -file-storage-mkdir-permission string        File Storage mkdir permission (default "0755")  -file-storage-write-permission string        File Storage write permission (default "0666")  -file-storage-expiration duration        File Storage expiration duration e.g. 24h. Default no expiration  -aws-access-key-id string        AWS Access Key ID. Required if using S3 Loader or S3 Storage  -aws-region string        AWS Region. Required if using S3 Loader or S3 Storage  -aws-secret-access-key string        AWS Secret Access Key. Required if using S3 Loader or S3 Storage  -aws-session-token string        AWS Session Token. Optional temporary credentials token  -s3-endpoint string        Optional S3 Endpoint to override default  -s3-safe-chars string        S3 safe characters to be excluded from image key escape. Set -- for no-op  -s3-force-path-style        S3 force the request to use path-style addressing s3.amazonaws.com/bucket/key, instead of bucket.s3.amazonaws.com/key  -s3-loader-bucket string        S3 Bucket for S3 Loader. Enable S3 Loader only if this value present  -s3-loader-base-dir string        Base directory for S3 Loader  -s3-loader-path-prefix string        Base path prefix for S3 Loader  -s3-result-storage-bucket string        S3 Bucket for S3 Result Storage. Enable S3 Result Storage only if this value present  -s3-result-storage-base-dir string        Base directory for S3 Result Storage  -s3-result-storage-path-prefix string        Base path prefix for S3 Result Storage  -s3-result-storage-acl string        Upload ACL for S3 Result Storage (default "public-read")  -s3-result-storage-expiration duration        S3 Result Storage expiration duration e.g. 24h. Default no expiration  -s3-storage-bucket string        S3 Bucket for S3 Storage. Enable S3 Storage only if this value present  -s3-storage-base-dir string        Base directory for S3 Storage  -s3-storage-path-prefix string        Base path prefix for S3 Storage  -s3-storage-acl string        Upload ACL for S3 Storage (default "public-read")  -s3-storage-expiration duration        S3 Storage expiration duration e.g. 24h. Default no expiration          -aws-loader-access-key-id string        AWS Access Key ID for S3 Loader to override global config  -aws-loader-region string        AWS Region for S3 Loader to override global config  -aws-loader-secret-access-key string        AWS Secret Access Key for S3 Loader to override global config  -aws-loader-session-token string        AWS Session Token for S3 Loader to override global config  -s3-loader-endpoint string        Optional S3 Loader Endpoint to override default  -aws-storage-access-key-id string        AWS Access Key ID for S3 Storage to override global config  -aws-storage-region string        AWS Region for S3 Storage to override global config  -aws-storage-secret-access-key string        AWS Secret Access Key for S3 Storage to override global config  -aws-storage-session-token string        AWS Session Token for S3 Storage to override global config  -s3-storage-endpoint string        Optional S3 Storage Endpoint to override default  -aws-result-storage-access-key-id string        AWS Access Key ID for S3 Result Storage to override global config  -aws-result-storage-region string        AWS Region for S3 Result Storage to override global config  -aws-result-storage-secret-access-key string        AWS Secret Access Key for S3 Result Storage to override global config  -aws-result-storage-session-token string        AWS Session Token for S3 Result Storage to override global config  -s3-result-storage-endpoint string        Optional S3 Storage Endpoint to override default  -gcloud-safe-chars string        Google Cloud safe characters to be excluded from image key escape. Set -- for no-op  -gcloud-loader-base-dir string        Base directory for Google Cloud Loader  -gcloud-loader-bucket string        Bucket name for Google Cloud Storage Loader. Enable Google Cloud Loader only if this value present  -gcloud-loader-path-prefix string        Base path prefix for Google Cloud Loader  -gcloud-result-storage-acl string        Upload ACL for Google Cloud Result Storage  -gcloud-result-storage-base-dir string        Base directory for Google Cloud Result Storage  -gcloud-result-storage-bucket string        Bucket name for Google Cloud Result Storage. Enable Google Cloud Result Storage only if this value present  -gcloud-result-storage-expiration duration        Google Cloud Result Storage expiration duration e.g. 24h. Default no expiration  -gcloud-result-storage-path-prefix string        Base path prefix for Google Cloud Result Storage  -gcloud-storage-acl string        Upload ACL for Google Cloud Storage  -gcloud-storage-base-dir string        Base directory for Google Cloud  -gcloud-storage-bucket string        Bucket name for Google Cloud Storage. Enable Google Cloud Storage only if this value present  -gcloud-storage-expiration duration        Google Cloud Storage expiration duration e.g. 24h. Default no expiration  -gcloud-storage-path-prefix string        Base path prefix for Google Cloud Storage          -vips-max-animation-frames int        VIPS maximum number of animation frames to be loaded. Set 1 to disable animation, -1 for unlimited  -vips-disable-blur        VIPS disable blur operations for vips processor  -vips-disable-filters string        VIPS disable filters by csv e.g. blur,watermark,rgb  -vips-max-filter-ops int        VIPS maximum number of filter operations allowed. Set -1 for unlimited (default -1)  -vips-max-width int        VIPS max image width  -vips-max-height int        VIPS max image height  -vips-max-resolution int        VIPS max image resolution  -vips-mozjpeg        VIPS enable maximum compression with MozJPEG. Requires mozjpeg to be installed  -vips-avif-speed int        VIPS avif speed, the lowest is at 0 and the fastest is at 9 (Default 5).  -vips-strip-metadata        VIPS strips all metadata from the resulting image          -sentry-dsn        include sentry dsn to integrate imagor with sentry
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